Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session N68: Creation, Control and Manipulation of Chiral Spin Textures
11:30 AM–2:30 PM,
Wednesday, March 8, 2023
Room: Room 420
Sponsoring
Unit:
GMAG
Chair: Rebecca Dally, National Institute of Standards and Technology
Abstract: N68.00004 : Pulling Magnetic Skyrmions out of Thin Air*
1:18 PM–1:54 PM
Presenter:
Gong Chen
(Georgetown University)
Authors:
Gong Chen
(Georgetown University)
Colin Ophus
(Lawrence Berkeley National Laboratory)
Roberto Lo Conte
(University of Hamburg)
Alberto Quintana-Puebla
(Georgetown University)
Heeyoung Kwon
(Korea Institute of Science and Technology)
Gen Yin
(Georgetown University)
Changyeon Won
(Kyung Hee University)
Haifeng Ding
(Nanjing University)
Roland M Wiesendanger
(University of Hamburg)
Yizheng Wu
(Fudan Univ)
Andreas Schmid
(Lawrence Berkeley National Laboratory)
Kai Liu
(Georgetown University)
In another study, we focus on the interfacial Dzyaloshinskii-Moriya interaction (DMI), which stabilizes chirality with preferred handedness. Experimentally, controlling the handedness is crucial to tune the efficiency of current-induced manipulation of spin texture. This is conventionally achieved by stacking asymmetric multilayers where the thickness of each layer is at least a few monolayers. We observed a chirality switching in (Ni/Co)n multilayer induced by capping only 0.22 monolayer of Pd [2]. Using SPLEEM, we monitor the evolution of domain walls from left-handed to right-handed Néel walls and quantify the DMI induced by the Pd capping layer. We also observe the chiral evolution of a skyrmion during the DMI switching, where no significant topological protection is found as the skyrmion winding number varies. This corresponds to a minimum energy cost of < 1 attojoule during the skyrmion chirality switching.
These results open up new opportunities for designing energy-efficient skyrmionic and magneto-ionic devices. They also illustrate the effectiveness of SPLEEM in resolving magnetization vector in chiral spin textures with high spatial resolution.
*This work has been supported in part by the NSF (DMR-2005108), SRC/NIST SMART Center and US DOE.
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